Pneumatic-despatch apparatus.



No. 758,569 PATENTED APR. 26, 1904;

v G. P. STODDARD.

PNEUMATIC DESPATGH APPARATUS.

APPLICATION FILED MAY 7, 1903.

N0 MODEL.

WITNESSES: INVENTOR.

TTORNEKS,

ma NORRIS PETERS co. PHOTO-HTML. wmumumm a. c

Patented April 26, 1904:.

' UNITED STATES PATENT OFFICE.

' CHARLES E. STODDARD, OF BOSTON, MASSACHUSETTS. ASSIGNOR TO AMERICAN PNEUMATIC SERVICE COMPANY, OF DOVER, DELA- WARE, A CORPORATION OF DELAWARE.

SPECIFICATION forming part of Letters Patent No. 758,569, dated April 26, 1904.

Application filed May 7, 1903. Serial No. 155,990. (No model.)

To all Win mt it TIMI-y concern:

Be it known that I, CHARLns F. STODDARD, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Pneumatic-Despatch Apparatus, of which the following is a specification.

My invention relates to new and useful improvements in pneumatic-d espatch apparatus; and its object is to produce a novel and efiicient closed receiver for receiving carriers from the main tube-line or transmission-tube. My invention consists of certain novel features hereinafter. described, and particularly cushioning the carriers passing onto the table. The table is supported by the legs F F and the receiver by the legs F F. Within the valve-casings D and D are the valves G and G, respectively, provided with counterweights Cr and G These valves G and G swing on the shafts G and G suitably supported in the sides of the VfllVCfCRSlIlg'S D and D, and

on the outside of the valve-casings D and D are located the counterweights G G on the ends of the shafts G G The valve-casing D is in open communication with'the atmosphere through the port H. The rod J, extending along the outside of the valve-casing D is connected to the rod J 2 by means of the rocker J, and the rod J 2 is pivotally connected to the rocker-latch J L L L L are pins connecting the rods J and J 2 J, the rod J and the rocker-latch J The relief-port P, connecting the chambers D and D through the port P, is controlled by the valve P on the rod 1, which is operated by the diaphragm P held on the rod P between the plates P P and normally held closed by the spring P.

Q, is a shoulder on the rod P and Q is a pawl on the rocker-latch J, which engages the shoulder Q, as hereinafter described. Through the pipe R pressure is provided to the rear side of the diaphragm P to balance it when the machine is in its normal position. The valves G and G are constructed so that their areas above the shafts G G are larger than the areas of the portions below the shafts. This arrangement makes the pressure on the valves G G greater above the shafts than below and tends to keep the valves tightly closed. The counterweights G G bring the valves G G into a closed position after they have been opened. The carrier coming in from the transmission-tube A passes through the slotted casing C into the compression-chamber D and is slackened in speed by compressing the air in front of it. This compressed air in front of the carrier communicates with the front side of the diaphragm P through the port P, and as this pressure is greater than the pressure back of the carrier, which is communicated to the back side of the diaphragm P through the pipe R, it throws the diaphragm to the opposite sideof the chamber from that shown in the figure and opens the valve P The diaphragm is held in its open position by the pawls Q and the rocker-latch J dropping in front of the shoulder Q. This relieves the pressure in front of the carrier by allowing it topass into the atmosphere through the port P, port P, chamber D and port H in the valve-casing D The carrier continues its travel under diminished speed controlled by the size of the port H until it strikes the valve G. which it swings open, and passes under the same into the chamber D the valve G closing by the counterweight G immediately after the carrier has passed out from under it. The carrier moving ahead still under reduced speed strikes the valve G, and

opening the same it then passes onto the ta- V ble D. As the valve G reaches its full open position the counterweight Gr strikes the rod J, which communicates the motion through the rocker J to the rod J which in turn pulls the rocker-latch J 3 against the tension of the spring S, and this operation pulls the pawl Q away from the shoulder Q, releasing the rod P", when the spring P pushes the diaphragm P back into its normal position, thereby closing the valve P After the carrier has passed out under the Valve G onto the table D" the counterweight Gr immediately closes the valve Gr, leaving the closed receiver in position for another operation.

Having thus described the nature of my invention and set forth a construction embodying the same, what I claim as new, and desire to secure by Letters Patent of the United States, is

1. In an apparatus of the character described, a terminal, and valves located in said terminal and adapted to be opened for the passage of the carrier by the carrier and having their greater area located out of the line of travel of the carrier and in the same plane as the smaller area.

2. In an apparatus of the character described, a terminal, valves located insaid terminal and adapted to be opened for the passage of the carrier by the carrier and having their greater area located out of the line of travel of the carrier and in the same plane as the smaller area, and means for closing said valves after the passage of the carrier.

3. In an apparatus of the character described, a terminal, and unbalanced valves located in said terminal and adapted to be opened for the passage of the carrier by the carrier and having their greater area located out of the line of travel of the carrier and in the same plane as the smaller area.

4. In an apparatus of the character described, a terminal, unbalanced valves in said terminal and adapted to be opened for the passage of the carrier by the carrier and having their greater area located out of the line of travel of the carrier and in the same plane as the smaller area, and means for closing said valves after the passage of the carrier.

5. In an apparatus of the character described, a terminalya valve located in said terminal and adapted to be opened for the passage of the carrier by the carrier, means for closing said valve after the passage of the carrier, a passage around said valve for the compressed air ahead of the carrier, at relief-valve normally closing said passage and adapted to be opened by the air compressed by the carrier, means for holding said relief valve open, and mechanism for releasing said relief-valve to allow the same to close on the passage of the carrier from the terminal.

6. In an apparatus of the character described, a terminal, a valve located in said terminal and adapted to be opened for the passage of the carrier by the carrier, a passage around said valve for the com pressed air ahead of the carrier, a relief-valve normally closing said passage and adapted to be opened by the air compressed ahead of the carrier, yielding means for holding said relief-valve closed, means for holding said relief-valve open, a second valve in the terminal located in the line of travel of the carrier and adapted to be opened for the passage of the carrier by the carrier, means for closing said second valve after the passage of the carrier, and mechanism operated by the movement of said second valve for releasing said relief-valve to allow the same to close on the passage of the carrier from the terminal.

In testimony whereofl have signed my name to this specification, in the presence of two subscribing witnesses, this 18th day of April, A. D. 1903.

CHARLES F. S ODDARD.

Witnesses:

A. L. MESSER, E. L. HARLOW. 

